He added: "Like I say in one of the programmes, I always assess first: how deep is it, how cold is it, are there hidden dangers under the surface such as rocks or branches?

"Also, where can I get out, is there a current, or a rip tide?

"And though I sometimes swim alone - I am experienced at it, and I know my limits. I always get out before you feel cold."

However, Mr Maclean said there are also places in Scotland where most people should be able to swim safely.

Mr Maclean said: "There's a boom in wild swimming at the moment.

Image copyrightCalum MacleanImage caption
Mr Maclean, pictured in Loch Loyne in the Highlands, shares his passion for wild swimming in online films and vlogs
Image copyrightCalum MacleanImage caption
A recce with a film crew at Loch Coruisk on Skye for the new TV programme on BBC Alba

"It's very popular now in Scotland and England - in fact all over the world; groups are forming on social media to help people find out about the best natural swimming pools and go swimming together.

"I think the reason it's so big now is because it becomes addictive - you go once and then you've just got to go again."